Ventilator.



No. 763,977. PATENTED JULY 5, 1904;

J. G. HENVIS.

VENTILATOR.

APPLICATION FILED SEPT.11. 1901.

N0 MODEL.

' of the ventilator, having an extension a, with UNITED STATES Patented July 5, 1904.

PATENT OFFICE.

VENTILATOR.

SPECIFICATION forming part of Letters Patent No. 763,977, dated July .5, 1904,

Application filed September 11, 1901. Serial No. 75,026- (No model.)

. To all whom it may concern.-

Be it known that I, JosErH C. HENvIs, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Ventilators, of which the following is a specification.

My invention relates to certain improvements in ventilators used on buildings, ventilating-shafts, chimneys, &c.; and the object of my invention is to improve the details of construction of the ventilator and the braces for holding the assembled parts rigidly together.

In the accompanying drawings, Figure 1 is a perspective view, partly broken away, illustrating the invention. Fig. 2 is a vertical sectional view. Fig. 3 is a plan view. Fig. 4is a perspective view of one of the braces. Fig. 5 is a detailed view showing the method of forming the ribs, and Fig. 6 is a view of a modified form of ventilator.

Referring to Figs. 1, 2, and 3, A is the base an outturned flange a. Directly above the flue-opening is an inner deflector B in the form of an inverted cone, and above the inverted cone is a hood-section D, also in the form of a cone.

Surrounding the cones and the upper por. tion of the extension a is an outer deflector E. The lower portion 0 is slightly tapered toward the extension 0, and the upper portion a has a considerable taper and overlaps the hood-section D.

Heretofore the surfaces of the conical deflector B and hood D have been smooth; but I form on the deflector B a series of radiating ribs 6, which extend from the apex'to the base of the deflector, and I form on the hood D a series of radiating ribs 02. These ribs are higher at the base of the hood than at the apex in the present instance; but they may be of an even height throughout, if desired,

By forming the conical inner deflector and hood in this manner they can be pressed from a single sheet of metal, with the ribs formed at the same time the cones are formed, making a very stiff construction, and consequently the deflector and hood can be made of lighter material than heretofore and yet will be perfectly rigid, and the cost of manufacture will be considerably reduced. Furthermore, by forming ribs on the conical hood D the rain striking the hood is held so as to flow readily from the hood and is prevented from swirling around and tending to make the draft uneven, and by making the ribs on the inner deflector B the same effect is produced in the currents of air arising from the ventilator stack or chimney.

Tests have shown that by the use of the ribbed deflector and hood the operation of the ventilator is considerably improved.

The invention also relates to the particular form of brace used for securing the several parts of the ventilator rigidly together.

G is the brace shown in Figs. 2 and 4. This brace has a body portion 9, a lateral extension 9, and a vertical extension 9 The outer end of the lateral extension has a lug which is socured to the base of the outer deflector E, and a lug g is secured to the flange a" of the extension a, while the upper end of the extension 9 rests under the upper portion 6 of the deflector E. 5

The liood D is secured to the lug g and the inner deflector is secured to the lug These parts are preferably riveted to the brace, and any number of braces may be used, according to the size of the ventilator. On small ventilators three braces are suflicient; but in large ventilators the number may be increased.

A drip-catcher it is arranged on an angle at the junction ofthe vertical member g and the lateral extension 9 and is for the purpose of carrying off the drip-water that may trickle down the extension of the brace.

In order to strengthen the portion 0 of the outer deflector, the metal is preferably turned over a strengthening-wire o', making this portion of the ventilator more rigid than heretofore.

While I have shown a cylindrical ventilator in Figs. 1, 2, and 3, the ventilator may be oval in cross-section when it is desired to arrange a number of ventilators close together, or it may be made quadrangular, as shown in Fig. 6, without departing from the main features of my invention.

In Fig. 6, A is the base-section, D the hoodsection having ribs ,thereon, and under the COO hood -section is an inner deflecting-section similar in shape to the hood, and surrounding the parts above mentioned is the outer deflector E.

I claim as my invention 1. The combination in aventilator, of a basesection, an outer casing or deflector surrounding said base-section, an inner deflector mounted above the base-section, and a series of tapering ribs projecting from said deflector, said ribs forming abrupt changes in the surface of said deflector, substantially as described.

2. The combination in deflector, of a basesection, an outer casing or deflector, an inner deflector of inverted-cone shape mounted above the base-section, a series of ribs projecting outwardly from said deflector, a conical hood-section mounted above the inner deflector, and ribs projecting outwardly from the conical hood-section, said ribs forming abrupt changes in the surface of the inner deflector and the conical hood-section, and serve to prevent the whirling of rain and air within the outer deflector or easing, substantially as described.

3. The combination in a deflector, of a basesection, conical deflectors mounted above the base-section, one of said cones being inverted,

tapering ribs projecting from each conical deflector, said ribs providing abrupt changes in the surface of said deflectors, and an outer deflector surrounding the cones and extending below the mouth of the base-section, substan tially as described,

4:. The combination in a Ventilator, of the base-section, a conical hood-section mounted above the base-section, and ribs projecting from said hood-section and forming abrupt changes in the surface of the same, said ribs being higher at the base of the cone than at the apex, substantially as described.

5. As a new article of manufacture, a brace for ventilators consisting of a body portion having two lugs midway of its length and beveled at its upper end, a downward extension having a lug and a horizontal extension also having a lug, and inclined ribs on the bodyseetion ot' the brace acting as a rain-shield, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH C. HENVIS.

WVitnesses:

WILL. A. BARR, J os. H. KLEIN. 

